The coroner said: ‘It had been thought Jack was not in the shed but it quickly became apparent Jack had been in the shed throughout.

‘I feel quite satisfied that Jack would have instantly lost consciousness because of the toxic effect of those fumes and would have been unaware of what was happening from that point on.

‘I do believe that, at this time, this was a fully developed fire and, sadly, it’s likely that Jack had already passed away at this time due to the intensity of the fire.

‘I believe the fire was likely due to the vapour fumes in the shed.

‘These became mixed with the oxygen such that the candle was responsible then for igniting those fumes.’

The blaze took place at his home in Campsall (Picture: Google Maps)

Firefighters found his body as the extinguished the blaze (Picture: Getty Images)

Ms Mundy said she will also write to South Yorkshire Fire and Rescue Service to raise concerns about a four minute delay in their response, although she did not believe it would have changed the outcome.